42642331 has 2 divisors, whose sum is σ = 42642332. Its totient is φ = 42642330.

The previous prime is 42642269. The next prime is 42642343. The reversal of 42642331 is 13324624.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42642331 - 2¹³ = 42634139 is a prime.

It is a super-2 number, since 2×42642331² = 3636736786227122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42642296 and 42642305.

It is not a weakly prime, because it can be changed into another prime (42642361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21321165 + 21321166.

It is an arithmetic number, because the mean of its divisors is an integer number (21321166).

Almost surely, 2^42642331 is an apocalyptic number.

42642331 is a deficient number, since it is larger than the sum of its proper divisors (1).

42642331 is an equidigital number, since it uses as much as digits as its factorization.

42642331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 25.

The square root of 42642331 is about 6530.1095702905. The cubic root of 42642331 is about 349.3657383754.

Adding to 42642331 its reverse (13324624), we get a palindrome (55966955).

The spelling of 42642331 in words is "forty-two million, six hundred forty-two thousand, three hundred thirty-one".